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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91e277b405a9ad05078bfa2175bb74ab7037852facf1c697d8ce031f62aa74e' 
  AND token = 'R6c6SBsZRKlrcZ0AgXJX35AqYGeKc6BPuPaxdGLk9dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}